Siemens SIMATIC S7-GRAPH Manual page 195

Index Name Description
S0X Array_2 of the steps to be
deactivated
S1X Array_2 of the steps to be
activated
S_DISPLAY Copy of the output parameter
S_NO (can also be evaluated if
the minimum parameter set
option is selected)
S_SEL_OLD System-internal
S_DISPIDX System-internal
T_DISPIDX System-internal
Length of the Index Arrays
The length of the index arrays TVX to S1X is obtained as follows:
l = (maximum number of elements) + 2
The index arrays are structured as follows:
Array[0]
Array[1] - Array[n-2]
Array[n-1]
New entries are added at the end. When entries are removed, the array is shifted
together. This means that, for example, in the array of active steps (SAX), the step
that is active longest has the lowest index.
S7-GRAPH for S7-300/400 Programming Sequential Control Systems
C79000-G7076-C526-01
Data Length Read
Type in Bytes
BYTE S_CNT+2 no
BYTE S_CNT+2 no
INT 2 yes
INT 2 no
BYTE 1 no
BYTE 1 no
= Index of the first free position in the array
= Entries
= 0 (indicates the end of the array)
Instance DB
Write Int. Read
int. Ext.
no no
no no
no yes
no no
no no
no no
Write
Ext.
no
no
no
no
no
no
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